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From | oconnor7@u.washington.edu |
To | statalist@hsphsun2.harvard.edu |
Subject | st: gpscore for propensity score of 4 observed groups |
Date | Tue, 12 Oct 2010 14:15:18 -0700 (PDT) |
Hi, I have technical question regarding gpscore. If my treatment variable is type of injury severity, what should I put for "cutpoints", "index", and "nq_gps"? The treatment level has four different levels of injury severity. What I am seeking is to create a propensity score for the likelihood that a person develops a certain type of injury, in this case TBI, based upon a list of covariates. This is the syntax I used for a preliminary analysis: gpscore age child_gender prev_anxiety prev_depn prev_adhd prev_behavioral prev_other_mh, t(inj_severity) gpscore(mygps) predict(hat_inj_sev) sigma(hat_sd) cutpoints (inj_severity) index(p50) nq_gps(4) Again, I am unsure of cutpoints, index, and nq_qps given that I have four established groups for the treatment variable.Thank you, Stephen
Stephen O'Connor Senior Fellow Harborview Injury Prevention & Research Center Department of Psychiatry & Behavioral Sciences University of Washington at Harborview Medical Center * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/